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[cumulus.git] / python / cumulus / store / __init__.py

diff --git a/python/cumulus/store/__init__.py b/python/cumulus/store/__init__.py
index 5ebf0d7..e368c57 100644 (file)
--- a/python/cumulus/store/__init__.py
+++ b/python/cumulus/store/__init__.py
@@ -1,22 +1,92 @@
-import re
+# Cumulus: Efficient Filesystem Backup to the Cloud
+# Copyright (C) 2008-2010 The Cumulus Developers
+# See the AUTHORS file for a list of contributors.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import exceptions, re, urllib.parse
 
 type_patterns = {
     'checksums': re.compile(r"^snapshot-(.*)\.(\w+)sums$"),
     'segments': re.compile(r"^([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})(\.\S+)?$"),
-    'snapshots': re.compile(r"^snapshot-(.*)\.lbs$")
+    'snapshots': re.compile(r"^snapshot-(.*)\.(cumulus|lbs)$")
 }
 
-class Store:
+class NotFoundError(exceptions.KeyError):
+    """Exception thrown when a file is not found in a repository."""
+
+    pass
+
+class Store (object):
     """Base class for all cumulus storage backends."""
 
-    def list(self, type):
-        raise NotImplementedException
+    def __new__ (cls, url, **kw):
+        """ Return the correct sub-class depending on url,
+        pass parsed url parameters to object
+        """
+        if cls != Store:
+            return super(Store, cls).__new__(cls, url, **kw)
+        (scheme, netloc, path, params, query, fragment) \
+            = urllib.parse.urlparse(url)
+
+        try:
+            cumulus = __import__('cumulus.store.%s' % scheme, globals())
+            subcls = getattr (cumulus.store, scheme).Store
+            obj = super(Store, cls).__new__(subcls, url, **kw)
+            obj.scheme = scheme
+            obj.netloc = netloc
+            obj.path = path
+            obj.params = params
+            obj.query = query
+            obj.fragment = fragment
+            return obj
+        except ImportError:
+            raise NotImplementedError("Scheme %s not implemented" % scheme)
+
+    def list(self, path):
+        raise NotImplementedError
+
+    def get(self, path):
+        raise NotImplementedError
+
+    def put(self, path, fp):
+        raise NotImplementedError
+
+    def delete(self, path):
+        raise NotImplementedError
+
+    def stat(self, path):
+        raise NotImplementedError
+
+    def scan(self, path):
+        """Cache file information stored in this backend.
+
+        This might make subsequent list or stat calls more efficient, but this
+        function is intended purely as a performance optimization."""
+
+        pass
+
+    def close(self):
+        """Tear down the connection explicitly if needed
+
+        Currently needed for sftp to be able to end the program."""
 
-    def get(self, type, name):
-        raise NotImplementedException
+        pass
 
-    def put(self, type, name, fp):
-        raise NotImplementedException
+    def __del__(self):
+        self.close()
 
-    def delete(self, type, name):
-        raise NotImplementedException
+def open(url):
+    return Store(url)